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From the standpoint of radiological protection and diagnostic procedures, dose evaluation of the urinary bladder is important since the radionuclides entered the body are partially excreted by urine. As the absorbed dose for the radiosensitive cells reflects the radiation risks, the present study has evaluated the photon and electron SAFs for the basal cells-radiosensitive cells-in the bladder wall as well as the bladder wall surface using a Monte Carlo code. S values were also evaluated for nine radionuclides : 11C 13N, 15O 18F 89Sr, 90Sr, 90Y, 99mTc and 123I. Consequently, the photon SAFs for basal cell layers in the energy range 10-30 keV are significantly larger than those of the whole bladder wall. The electron SAFs in all cases increase with the electron energy in the range 10 keV-4 MeV. As for S values, the discrepancy was observed between the result of this study and conventional values, particularly in low energy region. These results demonstrate that determining the depth of radiosensitive cells is necessary for realistic dose evaluation.

Evaluation of Absorbed Doses for Photon and Electron to the Urinary Bladder Wall Considering Radiosensitive Cells